A photographer is murdered shortly after exhibiting a compromising picture of Barnaby - who becomes a suspect in the ensuing investigation. Joyce concludes that someone is trying to frame him, and is stunned when he admits to a previous relationship with the murdered man's wife. With Barnaby sidelined, Jones is forced to work with the irritating Martin Spellman to solve the case. Guest stars: Liza Goddard (Bergerac), Adrian Scarborough (Father Brown, Upstairs Downstairs) and Richard Lintern (Silent Witness).